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Verified answer
Bab AljabarMatematika SMP Kelas VII
a] 5x - 9 → karena tidak ada y, maka menggunakan bantuan 0y
5x + 0y - 9
7x + 15y
--------------- -
-2x - 15y -9
b] -3x + 5y - 4
5x - 3y + 7
------------------ -
-8x + 8y - 11
c] 5x² - 9xy - 4y²
-x² - 6xy + 3y²
----------------------- -
6x² - 3xy - 7y²